2 Marks Question

Write any two differences between comet and meteors.
Any two differences between comet and meteors are shown below in table:

Comets Meteors

Comets are very big in size. They are smaller in size.

They revolve round the sun in their orbit. They do not have any definite path so they do not more round the sun.
Why do meteors disappear in the atmosphere?
Meteors disappear in the atmosphere because the heat is produced due to the friction between them and the atmosphere. Then, it starts glowing brightly and changes into gas and vapour and disappears.
Write any two differences between meteor and meteorite.

Comets	Meteors
Comets are very big in size.	They are smaller in size.
They revolve round the sun in their orbit.	They do not have any definite path so they do not more round the sun.

Differences between meteor and meteorite are shown below in table:

Meteor	Meteorite
It is smaller than meteorite.	It is larger than metor.
It doesn't reach the earth because it burns completely in the atmosphere.	It can reach the earth because it does not burn completely in the atmosphere.
It doesn't affect life on the earth.	It may affect the life on the earth.

Mention any two reasons for sending artificial satellites into space.
Any two reasons for sending artificial satellites into space are:
1. To collect more and reliable information about solar systems, stars, nebulas, and galaxies.
2. To forecast the weather.
More info: To investigate different military and spying operations of enemies, To research life in outer space, To establish space-laboratory and to make spaceship in the future.
Meteorites are considered to be important for scientists, why?
Meteorites are considered to be important for scientists because they contain a record of our solar system's history going back some 4.6 billion years. By studying meteorites, we can learn details about how our solar system evolved into the Sun and planets of today.
Write any two differences between a light-year and the astronomical unit.

Any two difference between light year and astronomical unit are shown below in table:

Light year	Astronomical unit
Light year is the distance that light travels in one year.	The astronomical unit is a unit of length, roughly the distance from Earth to the Sun.
Its distance is 9.4607 × 10¹² km.	There are 15 crore kilometers in 1 astronomical unit.

Mars is a planet and the sun is called a star, why?
Mars is a planet because it does not have its own light and revolves around the sun in an elliptical orbit and the sun is called a star because it emits the light due to the nuclear reactions that occurred in its core and do not revolve around other stars.
Identify the following masses as the planet, comet, satellite, or galaxy?
1. Enke = comet
2. Bennet = comet
3. Titan = satellite
4. Milkyway = galaxy
Comet is seen at the gap of the long period, why?
Comet is seen in the gap of the long period because they revolved around the sun and have a very long period of revolution.
Write any two differences between constellation and galaxy.

Difference between constellation and galaxy are shown below in table:

Constellation	Galaxy
It is the group of few stars.	A galaxy is the group of billions of stars.
There are about 88 constellation.	There are about 10¹¹ galaxies in the universe.
They have regular pattern.	They have no regular pattern.

Write the name of heavenly bodies which are indicated by the following words.
1. Red planet = Mars
2. Dwarf planet = Ceres, Pluto, Eris, Haumea, and Makemake
3. Smallest planet = Mercury
4. Farthest planet = Neptune
More info: As of 2014, the IAU recognizes five named dwarf planets: Ceres, Pluto, Eris, Haumea, and Makemake.
Write any two differences between shooting star and star.

The difference between shooting star and star are shown in table below:

Shooting star	Star
It is made up of rocks and metal particles.	It is made up of hot gases heilum and hydrogen.
It produces light due to heat produced by atmospheric friction.	It has its own light.
Its size is small.	Its size is very big.
Its life span is very short.	Its life span is large.

The tail of comet disappears when it goes away from the sun, why?
When the comet approaches the sun, its ice gets vaporized due to the heat of the sun and gets spread overdue to the solar wind. Consequently, a tail structure is seen. As it moves away from the sun, the vaporized mass gets condensed and the tail disappears.
Classify the following heavenly bodies in terms of asteroid, satellite, and comet. Write any two evidences that clarify the existence of a black hole.
1. Shoemaker levy = comet
2. Ceres = asteroid
3. Titan = satellite
The evidences that clarify the existence of a black hole are:
1. Presence of binary stars.
2. The gaseous and dust particles are engulfing by an invisible object.
3. Presence of multiple stars in the universe.
Life is not possible in Venus through it contains water, oxygen, and carbon dioxide, give a reason.
Life is not possible on Venus through it contains water, oxygen, and carbon dioxide because it has an atmosphere of dense CO₂, water vapour and clouds of H₂SO₄, this thick atmosphere traps the solar radiation and temperature rise to as high as 480°C where life is not possible.
What do the following words denote?
1. Red planet = Mars
2. Green planet = Uranus
3. Smallest planet = Mercury
4. Dwarf planet = Ceres, Pluto, Eris, Haumea, and Makemake
Categorize the following heavenly bodies in terms of constellation, comet, star, and satellite.
1. Titan = satellite
2. Sirius = star
3. Enke = comet
4. Cassopeia = constellation
Why do some stars look much brighter in the clear sky at night from the earth?
The brightness of the stars depends on their temperature and distance from the earth. Some stars are closer to earth with high temperatures. As a result, some stars look much brighter in the clear sky at night.